diff --git a/xmlschema/tests/test_validators.py b/xmlschema/tests/test_validators.py
index 11367138..b20a2458 100644
--- a/xmlschema/tests/test_validators.py
+++ b/xmlschema/tests/test_validators.py
@@ -1159,6 +1159,47 @@ def test_complex_elements(self):
             expected=XMLSchemaValidationError, indent=0, cdata_prefix='#'
         )
 
+    def test_encode_datetime(self):
+        xs = self.get_schema('<element name="dt" type="dateTime"/>')
+
+        dt = xs.decode('<ns:dt xmlns:ns="ns">2019-01-01T13:40:00</ns:dt>', datetime_types=True)
+        self.assertEqual(
+            etree_tostring(xs.encode(dt)),
+            '<ns:dt xmlns:ns="ns">2019-01-01T13:40:00</ns:dt>'
+        )
+
+    def test_encode_date(self):
+        xs = self.get_schema('<element name="dt" type="date"/>')
+        date = xs.decode('<ns:dt xmlns:ns="ns">2001-04-15</ns:dt>', datetime_types=True)
+        self.assertEqual(
+            etree_tostring(xs.encode(date)),
+            '<ns:dt xmlns:ns="ns">2001-04-15</ns:dt>'
+        )
+
+    def test_duration(self):
+        xs = self.get_schema('<element name="td" type="duration"/>')
+        duration = xs.decode('<ns:td xmlns:ns="ns">P5Y3MT60H30.001S</ns:td>', datetime_types=True)
+        self.assertEqual(
+            etree_tostring(xs.encode(duration)),
+            '<ns:td xmlns:ns="ns">P5Y3M2DT12H30.001S</ns:td>'
+        )
+
+    def test_gregorian_year(self):
+        xs = self.get_schema('<element name="td" type="gYear"/>')
+        gyear = xs.decode('<ns:td xmlns:ns="ns">2000</ns:td>', datetime_types=True)
+        self.assertEqual(
+            etree_tostring(xs.encode(gyear)),
+            '<ns:td xmlns:ns="ns">2000</ns:td>'
+        )
+
+    def test_gregorian_yearmonth(self):
+        xs = self.get_schema('<element name="td" type="gYearMonth"/>')
+        gyear_month = xs.decode('<ns:td xmlns:ns="ns">2000-12</ns:td>', datetime_types=True)
+        self.assertEqual(
+            etree_tostring(xs.encode(gyear_month)),
+            '<ns:td xmlns:ns="ns">2000-12</ns:td>'
+        )
+
 
 class TestEncoding11(TestEncoding):
     schema_class = XMLSchema11
diff --git a/xmlschema/validators/builtins.py b/xmlschema/validators/builtins.py
index 216f7512..aec3d440 100644
--- a/xmlschema/validators/builtins.py
+++ b/xmlschema/validators/builtins.py
@@ -416,28 +416,28 @@ def python_to_boolean(obj):
     # --- Year related primitive types (year 0 not allowed) ---
     {
         'name': XSD_DATETIME,
-        'python_type': (unicode_type, str, datatypes.DateTime),
+        'python_type': (unicode_type, str, datatypes.DateTime10),
         'admitted_facets': DATETIME_FACETS,
         'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
         'to_python': datatypes.DateTime10.fromstring,
     },  # [-][Y*]YYYY-MM-DD[Thh:mm:ss]
     {
         'name': XSD_DATE,
-        'python_type': (unicode_type, str, datatypes.Date),
+        'python_type': (unicode_type, str, datatypes.Date10),
         'admitted_facets': DATETIME_FACETS,
         'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
         'to_python': datatypes.Date10.fromstring,
     },  # [-][Y*]YYYY-MM-DD
     {
         'name': XSD_GYEAR,
-        'python_type': (unicode_type, str, datatypes.GregorianYear),
+        'python_type': (unicode_type, str, datatypes.GregorianYear10),
         'admitted_facets': DATETIME_FACETS,
         'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
         'to_python': datatypes.GregorianYear10.fromstring,
     },  # [-][Y*]YYYY
     {
         'name': XSD_GYEAR_MONTH,
-        'python_type': (unicode_type, str, datatypes.GregorianYearMonth),
+        'python_type': (unicode_type, str, datatypes.GregorianYearMonth10),
         'admitted_facets': DATETIME_FACETS,
         'facets': [COLLAPSE_WHITE_SPACE_ELEMENT],
         'to_python': datatypes.GregorianYearMonth10.fromstring,